C program to print hollow diamond star pattern

Write a C program to print hollow diamond star pattern series of n rows using for loop. How to print hollow diamond star pattern structure in C program. Logic to print hollow diamond star pattern in C programming.

Required knowledge

Basic C programming, For loop, Nested loop

Must know - Program to print diamond star pattern

Logic to print hollow diamond star pattern

The pattern seems to be one of the complex pattern to think. To make it easier, let us bisect in two halves.

Here in the upper part of the pattern, trailing and leading stars are inverted right triangle pattern that can be easily printed. Each row contains 2*rownumber - 2 spaces.

Moving on to the second half, if you look at the trailing and leading stars you will find that both of them are right triangle star pattern and total number of spaces per row is 2*rownumber - 2.

Program to print hollow diamond star pattern

/**
 * C program to print hollow diamond star pattern
 */

#include <stdio.h>

int main()
{
    int i, j, n;

    printf("Enter value of n : ");
    scanf("%d", &n);

    // Loop to print upper half of the pattern
    for(i=1; i<=n; i++)
    {
        for(j=i; j<=n; j++)
        {
            printf("*");
        }

        for(j=1; j<=(2*i-2); j++)
        {
            printf(" ");
        }

        for(j=i; j<=n; j++)
        {
            printf("*");
        }

        printf("\n");
    }

    // Loop to print lower half of the pattern
    for(i=1; i<=n; i++)
    {
        for(j=1; j<=i; j++)
        {
            printf("*");
        }

        for(j=(2*i-2); j<(2*n-2); j++)
        {
            printf(" ");
        }

        for(j=1; j<=i; j++)
        {
            printf("*");
        }

        printf("\n");
    }

    return 0;
}

Output

Enter value of n : 5
**********
****  ****
***    ***
**      **
*        *
*        *
**      **
***    ***
****  ****
**********

Happy coding 😉

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